Need some Chemistry homework help, please?

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Srah

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A metal mercury, Hg is a liquid. It's density is 13.6 g/mL. There are exactly 1000 mL in 1 liter.

a. What is the volume of 680.9 grams of mercury?

b. There are 454 grams in a pound. What is the mass, in pounds, of 1.88 liters of mercury?

2. A student finds the volume of a liquid sample to be 36.88 mL. If the density of the liquid is 0.790 g/mL, what is the mass of the sample?
 
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